SQL | Parameters and return values exercise | Default values in parameters

This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.

You can learn how to do this exercise if you attend one of more of the courses listed below!

Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
Topic ==> Parameters and return values  (11 exercises)
Level ==> Average difficulty
Classroom ==> Fast-track SQL  /  Advanced SQL
Online ==> Fast-track SQL  /  Advanced SQL
Before you can do this exercise, you'll need to download and unzip this file (if you have any problems doing this, click here for help). Once you've done this:
  1. Go into SQL Server Management Studio;
  2. Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
  3. Execute this script.

This will generate the database that you'll need to use in order to do this exercise (note that the database and script are only to be used for exercises published on this website, and may not be reused or distributed in any form without the prior written permission of Wise Owl).

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Create a stored procedure called uspContinentEvents which filters events to show only those:

  • which took place in a given continent;
  • which took place on or after a given date; and
  • which took place on or before a given date.

When you run your procedure, it should show something like this:

Events for Asia

These results are for events in Asia between '1990-01-01' and '2000-01-01'.

You can use the LIKE clause to show all events whose continent name contains the parameter value you pass in.

Now try running uspContinentEvents without any values for the parameters.  You should get an error:

Error running procedure

The error you'll get when you run your procedure without passing any parameters in.

Unless you are using default values, all parameters must have a value. Set default values for each parameter to be the widest range that you can:

Default Parameter Values

Re-running the stored procedure with the widest defaults should result in 459 rows being returned.

Optionally save this as Defaulting is never wise.sql and close it down.

You can unzip this file to see the answers to this exercise, although please remember this is for your personal use only.
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